Type-writing machine.



J. A. RENNE.

TYPE WRITING MACHINE.

APPLIGATION :FILED 00127, 1910.

1,098,84m Patented June 2,1914.

/ V' f6 FZ5/ff ff la@ Z7 EOLUMBIA PLANOGRAPH Co.,\v^sH1NG'roN. D.

:TREN A. RENNIE, OIF

Application :Filed october 2?, 19N.

To all iol/.01u 'it muy corr/fern.

Be it known that l', donn A.. ltusnin, a citizen oit the United States, residing in liyudhurst, in the county of Bergen and tltate of New plei-soy, have invented certain new and useful ln'iprorenients in rlli/pelliriting Machines, oi" which the Viollowfng is a specification.

rThis invention relates to rolls such as used for feeding the paper in typcwriting machines, and particularly to those which run upon a rotatable platen around Which the Work sheet is Wrapped or carried.

The sott rubber paper feeding rolls usually employed 'upon typewriting niachines consist of solid cylinders, which are capable of only such slight yielding is due to lthe consistency of the rubber. lSuch rolls are not found to carry the paper accurately around the rotating platen. llloreover it is usually diiiicult to introduce a, sheet or sheets between the feed roll and the platen, unless the feed roll cast oil'. @ne diil'iculty is that the leading end oit the sheet tends to separate the ieed roll ifroni the platen, and hence the roll can only be driven throu gh 'the niediuni oi? the paper itselil, and this operation often proves unsuccesshil. Moreover, the pressure roll .is usually spring pressed with so inuch force against the platen, that often both the platen and the roll may be rotated lor an indefinite period `Wit-hout picking up the 'work sheet which is being presented to the bite of the roll and platen.

The principal. object oit this invention is to provide a roll which Will overcoine these diiliculties, and fhich Will be positive and reliable in action, inexpensive to niaruitac` ture, and not liable to deteriorate.

ln the accompanying drawings, Figure l is a perspective bottom view of the platen, a portion of the platen traine, and the pres sure rolls running upon the platen, ol the Weltknovvn Under-wood front strike typen Writing machine; the rear or main rolls being constructed according to the preferred orin of the present invention. 2 is a sectional perspective vie'iv taken crossivise through the body ot one oi the inain rolls. Fig. 3 is a sectional side elevation to illustrate the normal relation oi' the platen and' Speciiication o t Spetters Patent.

ll'atented June il, itil/l.

au no. asalta.

show how the rolls and pla-ten readily piek np :i sheet oi`A paper which is presented thereto. his L is a View similar to AFig. but showingm nuinber of sheets being ted bv the rolls and platen. liig. 5 is a longitudinal section oil? the 'forni olE roll seen at Figs. l and it this ligure, the roll is or' a pneuniatie construction, that is, it contains u gas (which may be wholly or partly air) under compression. l? 6 a roll similar to that seen at lligs. 'l to 5, but not containing a bod;7 'oit compressed air or gas as is the case at ll`ig. 5. Fig. l is a sectional diaating one method of making e roll tininus the inetal core) seen at in' 5 D. r A.the cylindrical platen l of the Underwood or other typewriting machine` which is usually rotatable by a knob 2. or otherwise, is provided with, a paper guide in the torni ot a rear inclined shell.l or plate 3, which curves :l-orivardly under the platen at llpon a horizontal rod which extends along under the platen troni end to end ot the platen traine, are pairs o'l arms 6, i', and S, 9, carrying for 7ard pressure rolls l() and rear pressure rolls lll, said rolls mounted on forward and rear shafts l2 and S-l journaled in said arms. lhe shafts and arnis are pressed toward the platen ,mby sin-ings l-l.

Tlhe prelerred 'torni oi" niy improved pressure roll illustrated as mounted on the rc r shattlt?) and similar rolls may be niounted on the iront shaft 'l2 it desired: and oit course these rolls may be used in still other connections. l

ln the i'ireiferi ttor-in ot iny invention. the roll coi's'ipri a tubular inet-al core l5. niounterfl loosely upon the sha'lt 13, and having at its ends heads 16, between which the sott rubber body oi: the roll is confined. r the roll itselit comprises a cylindrical ruhber core piece if?" and a peripheral portion it te run 'upon the platen; said portions being separated so that the roll hollow, but their ends being joined at 19; the core ilunfiions lll', the peripheral portions i8 and the ends lll hein preferably integral. The 'lil niay oe torined with cup portions 9.0 receive the heads l0. The core portions ll' may be vulcanized to the metal cores l5,

one of the main pressure rolls, and also' to i it desired, and one or both of the heads 16 may, if desired, be applied to the core after the vulcanization.

One method of manufacturing the rubber roll without the metal core 15 is illustrated at Fig. '7, in which a four-part mold is shown, comprising two similar opposite or complementary outer cupped portions Q1, 22, joining at their edges along the line 23, and two central or axial core pieces 24, 25, abutting within the mold. The unvulcanized rubber may be made in suitable parts and inserted in the mold, and form therein a hollow cylinder, as shown at 18a, Fig. 7. Vulcanization joins the parts together into one piece. lllithin the hollow 26 of the roll is inserted a small quantity of a suitable gasforming agent, as 27, which, during the heat of vulcanization, will expand and form a permanent gas. This gas-forming agent may be ammonium carbonate, which is usually employed in making hollow rubber balls. Sufficient of this Gas-producing agent may be used to permanently expand the roll from the cylindrical shape at Fig. 7 to the barrel shape seen at Fig. 5; the gas being sealed in the roll and in a state of slight but permanent compression, producing a bilge on the periphery of the roll. 1t will be understood, however, that by using a smaller quantity of gas-producing agent 27, the rubber may be vulcanized in the cylindrical shape shown at Fig. 7, and retain such shape after vulcanization. 1n such a case, the roll may afterward, if desired, be eX- panded to the Fig. 5 shape by any suitable means. At Fig. 3 the front rolls 10 are shown as having the hollow cylindrical form indicated at Fig. 7. rlhe rubber of the roll may be of such softness that when sarings le of suitable force are employed, the main rear roll in cross section will assume the form seen at Fig. 3, the side thereof in contact with the platen being flattened along the middle portion of the barrel; such portion of course being not firmly supported by the ends 19 of the roll, and hence being of a very yielding quality. As a consequence, the roll contacts with the surface of the platen for a considerable distance around the periphery of the latter, instead of substantially at a single point, as is the case with the solid rolls commonly employed, as at 10a, Fig. fi. This feature of the roll is of considerable importance, as it causes the paper to hug closely to the platen, and conduces materially to the accurate feed of the paper relatively to the platen.

lVhen introducing a single sheet of paper 28, the leading edge thereof, as will be seen at Fig. 3, is caught between the roll l1 and the platen, so as to be driven by the roll as well as by the platen, while a substantial portion of said roll is still in contact with the platen itself, so that the roll is directly driven by the platen while said roll is itself driving the sheet. 1n other words, the sheet does not separate the roll bodily from the platen when it is attempted to introduce the sheet, as is often the case in typewriters of present day construction, but is gripped between two drivers, both of which are in positive action. For this reason the sheet is very easily introduced into the machine, and is instantly picked up by the roll and platen and properly fed for *ard to the printing point, and the feed of the sheet is kept true until it leaves the rolls. 1t will be seen that a considerable area both longitudinally and circumferentially of each roll 11 is constantly running upon the platen or upon the paper, thus making a very efficient paper feed.

The yielding of the swollen portion 1S of the roll is due partly to its being supported by its ends instead of being supported throughout its length, as heretofore. The invention, however', includesv hollow rolls, whether or not they contain gas in a state of compression, or even if they are cylindrical in form, as at Figs. a and 7, since these rolls would yield much more readily than the ordinary solid rubber rolls, with the effect seen at Figs. 8 and l, and with the same beneficial results.

At Fig. #l it will be seen that if a large number of sheets is inserted, the roll may yield still more than at Fig. 3, if a strong spring la is employed; or in some cases the arm S which supports the roll may be made unyielding, the range of yield of the bilge portion 18 of the roll being sufficient to accommodate one sheet, as at Fig. S, or many sheets, as at Fig. e. TWhile I prefer the barrel shape illustrated, it will be understood that the form of the hollow roll may be modified within the scope of the invention.

In the form of the invention shown at- Fig. 6, the roll consists of a single hollow bilged body 18h, having ends 19a, to fit upon the core 15; the core piece 17 being omitted, and the roll merely containing air at ordinary pressure. Since there is lack of interior compressed gas support, the wall 18b may be made thicker than the wall 18 at F ig. 5, so as to give the requisite firmness.

Other variations may be resorted to within the scope of the invention.

Having thus described my invention, l claim:

1. rllhe combination with a revoluble platen, of a feed roll to run thereon comprisma` a bilged yielding body, a core portion, and ends, said body, core portion and ends being integral, and means for revolubly supporting said r ll.

2. s. feed roll to run on a r-evoluble platen, said feed roll comprising a bilged body, a core portion, and ends, said body, core portion and ends being integral, said body containing gas under pressure.

Il. A, feed roll to run on a revoluble platen, said feed roll comprising a core havinej heads, and. a soft rubber bilged body confined between said heads.

el. It fced roll to run on a revoluble platen, said feed roll eoi'nprisinn' a core having' heads, and a soft" rubber bilged body ha\i'ing' integral supporting' ends confined between said heads, said roll having an integral core-piece to lit upon said core.

o. The combination with a re'voluble ilaten, of a feed roll to run thereon, comprising' a core having' heads, and a soft rubber bile-ed body of continuous structure confined between said heads and having; an integral core-piece to iit upon said core and vulcanized thereto.

o'. rilhe combination with a revoluble platen, of a feed roll to run thereon, comprisinp; a core having' heads, and a soft rubber bilg'ed body confined between said heads and having' an integral coi-apiece to iit upon said core and vulcanized thereto, and containing' a body of gas under pressure.

T. VThe combination with a revoluble platen, of a bile'ed soft rubber feed roll of continuous structure to run thereon, the middle portion of said roll being' more yieldiup,n than its end portions.

8. The combination with a rotatable platen, of a .feed roll to run thereon, said roll. having` a hollow soft rubber body with yielding' ends, and means supporting' said roll. at said ends to communicate pressurewhereby said roll is flattened against the platen.

il. The combination with a rotatable platen, of a feed roll. to run thereon Compris ing' a hollow bilg'ed soft rubber body havinn` yielding ends, and means to flatten said body against the platen.

l0. The combination with a rotatable platen, of a feed roll to run thereon comprising' a hollow bile'ed soft rubber body with yielding ends, and means to flatten said body against the platen, said body and ends being' integral.

l1. T he combination with a platen, of forward and rear pressure rolls to run thereon, each of said rolls having' a. hollow soft rubber body of continuous structure, capable of spreading' against the platen, and means to spread the rolle against the platen.

l2. The combination with a rotatable platen, of a feed roll to run thereon, said roll comprising' a hollow soft rubber body of continuous structure, capable of spread ing' against the platen, and means for spreading' said body against the platen.

i3. The combination of a feed roll to run on a rotatable platen, said roll comprising' a hollow bilged soft rubber body of continuous structure, and means to flatten the same against the platen.

let. The combination of a feed roll to run on a rotin-.able platen, said roll comprising a hollow bilged soft rubber body having; ends, ind means applying' pressure at said ends to flatten the roll against the platen.

l5. rthe combination of a feed roll to run on a `rotatable platen, said roll comprising' a bilg'ed soft rubber body having' ends whereby it i5 supported, and means 'to trans mit pressure through said ends to the bilg'ed bedr to flatten the roll against the platen.

lo. The combination with a revoluble platen, of a feed roll to run thereon, said roll comprising a body of continuous structure expanded by an interior body of gas to ore ate a centering' peripheral enlargement of said body, and means for liattening said eX- panded body against the platen.

il". A. feed roll to run on a. revoluble platen, said feed roll comprising a bilged body of continuous structure expanded by an interior body of .g'as.

18. it feed roll to run on a revoluble platen, said feed roll comprising a bilged yielding' body, a core portion, and ends, said body, core portion and ends being@- integral.

19. it feed roll to run on a rotatable platen, said roll having a hollow Soft rubber biln'ed body of continuous structure with yielding' ends.

20. A feed roll to run on a rotatable platen, said roll having' a hollow soft rubber bilg'ed body of coiitinuous structure with soft rubber ends.

21. The combination of a bearing; rod, and a plurality of spaced feed rolls mounted on said rod to bear against a rotary platen, each roll comprisingl a hollow barrel-shaped sofi4 rubber body of continuous structure.

The combination of a` bearing; rod, and a plurality of spaced feed rolls mounted on said rod to bear against a rotary platen, each roll comprising a hollow barrel-shaped soft rubber body of continuous structure containing' a gas under compression.

in a typewritimq' machine, the combination with a rotary platen, of an elastie feed roll whose periphery is increasingly distended and increasingly yielding' toward the center as compared with the ends, said center sufficiently soft and yielding' under feeding),` pressure to lap a substantial distance around the platen, to thereby aiford ample Contact with said platen to be driven thereby at one place, while simultaneously presenting at another place an introductory lip to receive and draw inwardly the leading' edge of the worksheet supplied to the platen.

24. In a typewritinn' machine, the eombination with a rotary platen, of a hollow feed roll of soft rubber located at the introductory side of the platen, and means for pressing' the roll against the platen, the periphery of said roll being' increasingly dist-ended toward the center and suiliciently yielding 'Iii at the center to spread or lap around the Irubber not so yielding as its middle, to be platen for a substantial distance under feed eeetive in pressing the Work-sheet rmly 10 pressure, to thereby afford ample feed conagainst the platen.

tact with said platen to loe rotated thereby,

While Simultaneously presenting an ntro- JOHN A' RENNIE' duetort7 lip to receive and draw inwardly the Witnesses:

leading' edge of the Worksheet supplied to K. FRANKFORT,

the platen; the roll havingsolid ends of soft C. RIPLEY.

l Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, l

' Washington, D. C. 

